I think you should go to this link  

https://bitcointalk.org/index.php?topic=335145.0


I have more links


https://bitcointalk.org/index.php?topic=328996.0  

 this is a hashing black arrow project we have made a cash/fiat profit, but it is not perfect just so-so or good   .  it is slower black arrow gear then what you are looking at but it is a lifetime contract


this is the dZcoop list

https://bitcointalk.org/index.php?topic=315198.0

https://bitcointalk.org/index.php?topic=334360.0   this is a big winner in cash fiat prices.

I turned 3 k into 6k with them in under 2 months.

If I was spending money I would want 20 shares in the r17 buy.  20 shares would be 2600. 20 shares would be 800gh

you would mine in feb not march and your contract would not run out in 4 months.   if I was afraid to spend 2600 on the r17 (which I am afraid to do I would spend 1300 and get 400gh lifetime.

I suppose  the 4 month could be better but I know dZcoop has had 6 rounds of buys that made money and were on time for the most part.